21 September, 1972
TODAY IN PHILIPPINE HISTORY:
Using the rising wave of lawlessness and the threat of a Communist insurgency as justification, Marcos declared martial law by virtue of Proclamation No. 1081. Marcos, ruling by decree, curtailed press freedom and other civil liberties; closed down Congress and media establishments; and ordered the arrest of opposition leaders and militant activists, including his staunchest critics Senator Benigno Aquino, Jr. and Senator Jose Diokno.
Initially, the declaration of martial law was well received, given the social turmoil the Philippines was experiencing. Crime rates plunged dramatically after a curfew was implemented. Political opponents were given the opportunity to go into exile. But, as martial law dragged on for the next nine years, excesses by the military emerged.
Martial law was lifted on Jan. 17, 1981, although the suspension of the privilege of the writ of habeas corpus continued in the autonomous regions of Western Mindanao and Central Mindanao.
(Ref: Philippine History – PhilippineCountry.com)